fix "open current page" problem and support shortcuts

[e-zz]

• [x] Fix #7
• [x] Add support for shortcuts. One can change the default shortcuts in plugin setting.

Check the release here: https://github.com/e-zz/logseq-open-in-code/releases/tag/0.0.6

[rebornix]

Closing in favor of https://github.com/rebornix/logseq-open-in-code/pull/9